Gibney was a favorite for the role of Kathryn Janeway on Star Trek: Voyager and was even brought back to screen test a second time after Geneviève Bujold failed to work out, but Paramount rejected her due to her age, convinced she was too young. She also tested for Seven of Nine and the Borg Queen, but was rejected for both. Her character on TNG was mentioned in VOY.

More recently, Gibney had a recurring role on Crossing Jordan, as Suffolk County, Massachusetts, Assistant District Attorney Rene Walcott, alongside actor Miguel Ferrer. (Roxann Dawson had joined this program's production staff as one of its producers some time prior, or subsequent, to its premiere.)